阅读说明：本技术 一种提高铝板带轧制表面质量的控制方法 (Control method for improving rolling surface quality of aluminum plate strip ) 是由 黄金哲 冉继龙 胡勇 郑宏智 郑超蜜 何志航 朱义淼 于 2020-08-20 设计创作，主要内容包括：本发明公开了一种提高铝板带轧制表面质量的控制方法,包含以下内容：(1)磨削轧辊至其粗糙度Ra≤0.2μm,再采用电火花磨床打毛后粗糙度Ra0.4μm~1.2μm,(2)再采用六辊冷轧机生产,轧辊辊径400-480mm,工作辊型为平辊；轧制油温35±5℃、轧制油流量3000-3500L/min,轧制油压力6~9bar,厚度范围为：0.4~7.0mm,冷轧道次压下率2%~10%,轧制带材表面粗糙度为原始轧辊粗糙度的30%~40%；本发明的方法具有在冷轧生产过程减少带材表面小白点,粘伤、压过划痕,提高铝板带表面质量的效果。(The invention discloses a control method for improving rolling surface quality of an aluminum plate strip, which comprises the following steps: (1) grinding the roller until the roughness Ra is less than or equal to 0.2 mu m, roughening by adopting an electric spark grinder, and then obtaining the roughness Ra0.4 mu m-1.2 mu m, (2) producing by adopting a six-roller cold rolling mill, wherein the roller diameter is 400 plus 480mm, and the working roller is a flat roller; the rolling oil temperature is 35 +/-5 ℃, the rolling oil flow is 3000-: 0.4-7.0 mm, the reduction rate of cold rolling passes is 2-10%, and the surface roughness of a rolled strip is 30-40% of the roughness of an original roller; the method of the invention has the effects of reducing small white spots, sticking injuries and pressing scratches on the surface of the strip in the cold rolling production process and improving the surface quality of the aluminum plate strip.)

1. A control method for improving the rolling surface quality of an aluminum plate strip is characterized by comprising the following steps: the method comprises the following steps:

(1) grinding the working roll by using a 280# -320# grinding wheel to ensure that the surface transverse roughness Ra of the working roll is less than or equal to 0.2 mu m;

(2) performing surface treatment on the ground working roll in the step (1) by adopting a roll electric spark texturing process;

(3) and (3) producing the aluminum plate strip by adopting a six-roller cold rolling mill.

2. The control method for improving the rolling surface quality of an aluminum plate strip as claimed in claim 1, wherein: the grinding working roll in the step (1) is divided into 10 steps, and the technological parameters in each step are as follows:

pass: 10, the linear velocity of a grinding wheel is 18m/s, the rotating speed of a headstock is 25rpm/min, the Tuban speed is 1560mm/min, the current is 14A, the end part feeds 2 micrometers, and the end part feeds 3 micrometers continuously;

pass: 1, grinding wheel linear speed is 17m/s, headstock rotating speed is 25rpm/min, Tuban speed is 1560mm/min, current is 13A, end feeding is 1 mu m, and continuous feeding is 1 mu m;

pass: 1, the linear velocity of a grinding wheel is 16m/s, the rotating speed of a headstock is 25rpm/min, the Tuban speed is 1560mm/min, the current is 12A, the end part feeds 1 mu m, and the continuous feed is 1 mu m;

pass: 1, grinding wheel linear speed is 15m/s, headstock rotating speed is 25rpm/min, Tuban speed is 1560mm/min, current is 12A, end feeding is 1 mu m, and continuous feeding is 1 mu m; .

Pass: 1, grinding wheel linear speed is 14m/s, headstock rotating speed is 25rpm/min, Tuban speed is 1560mm/min, current is 11A, end feeding is 0 mu m, and continuous feeding is 1 mu m;

pass: 1, the linear velocity of a grinding wheel is 13m/s, the rotating speed of a headstock is 25rpm/min, the Tuban speed is 1560mm/min, the current is 10.5A, the end part feeds 0 mu m, and the continuous feed is 1 mu m;

pass: 1, the linear velocity of a grinding wheel is 12m/s, the rotating speed of a headstock is 25rpm/min, the Tuban speed is 1560mm/min, the current is 10A, the end part feeds 0 mu m, and the continuous feed is 1 mu m;

pass: 1, the linear velocity of a grinding wheel is 11m/s, the rotating speed of a headstock is 25rpm/min, the Tuban speed is 1560mm/min, the current is 9.5A, the end part feeds 0 mu m, and the continuous feed is 0 mu m;

pass: 1, grinding wheel linear speed is 10-11m/s, headstock rotating speed is 25rpm/min, Tuban speed is 1560mm/min, current is 9A, end feeding is 0 μm, and continuous feeding is 0 μm;

pass: 1, grinding wheel linear speed is 10-11m/s, headstock rotating speed is 35rpm/min, Tuban speed is 720mm/min, current is 8A, end feeding is 0 μm, and continuous feeding is 0 μm.

3. The control method for improving the rolling surface quality of an aluminum plate strip as claimed in claim 1, wherein: the roller electric spark texturing process in the step (2) is one of the following 6 processes;

power-on/power-off time: 7/13 μ s, current: 2A, pulse gain: 10, electrode tip to roll gap: 2.8mm, roll speed: 9rpm, electrode holder traveling speed: 27mm/min, roughness Ra: 0.4 μm, lap: 3;

power-on/power-off time: 8/11 μ s, current: 2A, pulse gain: 10, electrode tip to roll gap: 2.8mm, roll speed: 9rpm, electrode holder traveling speed: 27mm/min, roughness Ra: 0.5 μm, lap: 3;

time of power on/off: 8/11 μ s, current: 3A, pulse gain: 10, electrode tip to roll gap: 2.8mm, roll speed: 9rpm, electrode holder traveling speed: 27mm/min, roughness Ra: 0.6 μm, lap: 3;

power-on/power-off time: 8/14 μ s, current: 6A, pulse gain: 10, electrode tip to roll gap: 2.8mm, roll speed: 10rpm, electrode holder traveling speed: 27mm/min, roughness Ra: 0.7 μm, lap: 3;

power-on/power-off time: 8/14 μ s, current: 8A, pulse gain: 10, electrode tip to roll gap: 3.6mm, roll speed: 10rpm, electrode holder traveling speed: 27mm/min, roughness Ra: 1.0 μm, lap: 3;

power-on/power-off time: 8/14 μ s, current: 8A, pulse gain: 10, electrode tip to roll gap: 3.0mm, roll speed: 10rpm, electrode holder traveling speed: 27mm/min, roughness Ra: 1.2 μm, lap: 3.

4. the control method for improving the rolling surface quality of an aluminum plate strip as claimed in claim 1, wherein: the six-roller cold rolling mill in the step (3) has the production parameters: the roller diameter of the roller is 400 mm and 480 mm; the roller shape is a flat roller; the rolling oil temperature is 35 +/-5 ℃, the rolling oil flow is 3000-; the tensile strength of the material is 150-280MPa, and the yield strength is 120-250 MPa; the thickness range is as follows: 0.4-7.0 mm, and the cold rolling pass working rate is controlled to be 5-12%.

Technical Field

The invention belongs to the field of preparation of aluminum plate strips, and particularly relates to a control method for improving rolling surface quality of an aluminum plate strip.

Background

At present, the production process of aluminum alloy at home and abroad generally adopts the steps of supplying blanks for hot rolled coils or cast rolled coils, and controlling the product performance by annealing or adopting the processing rate of 15-25%; small white spots, sticking damage and over-pressing scratches are easily generated in the rolling process of a cold rolling mill, and cannot be eliminated by rolling of the mill, so that the appearance of the product is influenced and the product cannot be used; particularly, the anode oxidation material of a high-end product has strict requirements on surface quality, the product needs to be subjected to sand blasting anode oxidation, and rolling stripes exist on the surface after the product is subjected to sand blasting anode oxidation; the larger the surface roughness of the product is, the deeper the shading is, and after the product is subjected to sand blasting, the rolling lines cannot be eliminated; therefore, the roughness Ra of each pass of roller grinding is required to be controlled to be less than or equal to 0.4 mu m, and Rz is less than 3.0; the transverse roughness Ra of a roller ground by using the grinding wheel is less than or equal to 0.12 mu m after rolling, so that the problems of transverse scratch, sticking and white spots are caused. In order to improve the quality problem of the surface of the aluminum strip; by improving a roller grinding process, controlling the surface treatment roughness of the roller according to the requirement of a product, and after the surface treatment of the roller is carried out by adopting a Sarclad 12 electrode electric spark roller machine tool (namely EDT: Electro-shock treated), the tensile strength of the material is 150-280Mpa, and the yield strength is 120-250 Mpa; the cold rolling pass working rate is controlled to be 5-12%; the surface of the strip produced by using the electric spark textured roller is obviously improved and even eliminated in small white spots, adhesion damage and over-scratch, and the surface of the strip ground by the original grinding wheel keeps consistent in transverse and longitudinal roughness because the texture of the electric spark textured roller is transferred to the surface of the strip, and the cutting lines in the rolling line direction on the surface of the original strip are changed into disordered pit points, so that the specific surface area of the contact surface between the strips is increased, the problems of interlaminar dislocation, adhesion damage and white spots are solved, and the surface quality of the aluminum plate strip is improved.

Disclosure of Invention

The invention aims to provide a control method for improving the rolling surface quality of an aluminum plate strip aiming at the defects of the prior art, overcomes the problems that the prior production process uses 15-25% of machining rate control performance for controlling material properties, has the defects of small white point, sticking damage and over-pressing scratch of the surface quality and is difficult to control, and has the effect of improving or eliminating the small white point, sticking damage and over-pressing scratch.

In order to achieve the purpose, the invention adopts the following technical scheme:

a rolling method for improving the surface quality of an aluminum strip by roll surface treatment, comprising the steps of:

(1) grinding the working roll by using a 280# -320# grinding wheel to ensure that the surface transverse roughness Ra of the working roll is less than or equal to 0.2 mu m;

(2) performing surface treatment on the ground working roll in the step (1) by adopting a roll electric spark texturing process;

(3) and (3) producing the aluminum plate strip by adopting a six-roller cold rolling mill. The shape control of the six-roller mill has the function of adjusting the bending of the working roller and the middle roller, while the four-roller mill has the function of adjusting the bending of the working roller only, and the shape control and the surface quality control of the six-roller mill are superior to those of the four-roller mill when the aluminum plate strip with the thin material of 1.0-0.4 mm and the narrow width of less than or equal to 1300mm is rolled. The four-high mill has poor plate shape control capability, and is easy to generate the plate shape problem and influence the appearance quality.

Further, grinding the working roll, wherein the larger the granularity of the grinding wheel or the higher the roughness of the grinding wheel, the deeper and wider the cutting texture, so that a 280# -320# grinding wheel is adopted to grind the roller with the required roller surface roughness Ra less than or equal to 0.2 mu m; thereby ensuring the depth of the cutting lines of the roller and ensuring the roughness and color uniformity after the surface treatment of the electric spark.

Preparing a mixture of Jiaguduo syntilo66 cooling liquid and water by adopting a cutting liquid of a German Rischig grinder, wherein the required concentration is as follows: 3-6% and the pH value is 8-10; the grinding wheel adopts Atlantic 280-320 #, and the hardness of the grinding wheel is F grade; by adopting the grinding process shown in Table 1, the surface transverse roughness Ra of the working roll is less than or equal to 0.2 mu m, and the ground surface has no defects such as chromatic aberration, scratch and the like. The lines in the circumferential direction of the roller after being ground by the grinding wheel are shown schematically in the attached figure 1.

TABLE 1 work roll milling Process parameters

Further, roller electric spark texturing (EDT abbreviation, English Electro-Disharge Textured)

Roller electric spark principle: the electric spark is generated by applying a high voltage between the electrode and the roller to form electric conduction, the heat generated by the electric spark melts the electrode and the roller surface and forms air bubbles in the insulating oil, and when the power is turned off, the air bubbles are broken to leave a pit on the roller surface. By pulse discharge, millions of repeated operations are performed, so that controllable roughness and peak value of the roller surface are formed. Forming a real disordered electric spark surface by covering million times of physical and chemical reactions layer by layer; the electric spark roughened surface is in the shape of a rolling conduction surface of a rolling mill, the electric spark roughened surface can obtain a completely disordered strip surface, the repeatability is good, the surface is more excellent compared with a laser roughened non-ordered surface, and the texture of the roller surface after the roller electric spark is schematic (as shown in figure 2); laser texturing (see figure 3).

Secondly, the roller electric spark texturing process comprises the following steps: performing surface treatment by adopting an electric spark texturing machine tool of a British Sarclad 12 electrode; the main technical parameters comprise: the diameter of the roller is 400-480 mm; the roller is a flat roller, the roughness Ra of the original roller of the grinding wheel type is less than or equal to 0.2 mu m, and the roller is ground; selecting corresponding EDT roller roughness (Ra0.4-1.2 μm) according to the surface roughness requirement of a product strip; the roughness of the original roller transferred to the belt material is 30% -40%. Roughening according to any one of 6 technologies in the table 2; detecting by a German Taylor Hobson Surtronic S128 roughness meter; the process comprises the following steps:

TABLE 2 roughening Process parameters

Further, the rolling process parameters are as follows: the production is carried out by adopting a six-roller cold rolling mill, and the roller diameter of the roller is 400-; the roller shape is a flat roller; the rolling oil temperature is 35 +/-5 ℃, the rolling oil flow is 3000-; the tensile strength of the material is 150-280MPa, and the yield strength is 120-250 MPa; the thickness range is as follows: 0.4-7.0 mm, the cold rolling pass machining rate is controlled to be 5% -12%, and the corresponding EDT roller roughness (Ra0.4-1.2 mu m) is selected according to the surface roughness requirement of a product strip; the roughness of the original roller transferred to the belt material is 30% -40%. The roller rolled surface ground by using a common grinding wheel has small white spots and obvious sticking damage (as shown in figure 4), and the surface defects rolled by adopting the method are basically reduced or eliminated (as shown in figure 5).

Drawings

FIG. 1 is a surface texture diagram of a roller after grinding by a grinding wheel;

FIG. 2 is a texture map of the roll surface after electric spark texturing;

FIG. 3 is a texture map of the roll surface after laser texturing;

FIG. 4 is a surface view of an aluminum strip rolled by a grinding wheel mill roller;

FIG. 5 is a surface view of an aluminum strip after electric spark roughing roller rolling.

Detailed Description

The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples.